"""
Admin routes and functionality for VPN Server
"""
from fastapi import APIRouter, Depends, HTTPException, status, Request, File, UploadFile
from fastapi.responses import JSONResponse, FileResponse, StreamingResponse
from fastapi.security import OAuth2PasswordBearer
from sqlalchemy.orm import Session
from typing import List, Optional
from datetime import datetime
import os

from models.user import User, UserRole
from models.system import SystemHealth, AuditLog, Alert, ServerConfig
from services import backup_service, monitoring_service
from core.auth import get_current_active_user, get_current_admin_user
from core.database import get_db
from schemas.admin import (
    SystemHealthResponse,
    ServerConfigUpdate,
    AlertResponse,
    AuditLogResponse
)

router = APIRouter(
    prefix="/admin",
    tags=["admin"],
    responses={404: {"description": "Not found"}},
)

@router.get("/dashboard", response_model=dict)
async def admin_dashboard(
    current_user: User = Depends(get_current_admin_user),
    db: Session = Depends(get_db)
):
    """Admin dashboard data"""
    system_health = await monitoring_service.get_system_health()
    active_alerts = db.query(Alert).filter(Alert.status == 'active').order_by(Alert.created_at.desc()).all()
    audit_logs = db.query(AuditLog).order_by(AuditLog.timestamp.desc()).limit(50).all()
    
    return {
        "system_health": system_health,
        "active_alerts": active_alerts,
        "audit_logs": audit_logs
    }

@router.get("/system-health", response_model=SystemHealthResponse)
async def get_system_health(
    current_user: User = Depends(get_current_admin_user)
):
    """Get real-time system health metrics"""
    return await monitoring_service.get_system_health()

@router.post("/server-config", response_model=dict)
async def update_server_config(
    config: ServerConfigUpdate,
    current_user: User = Depends(get_current_admin_user),
    db: Session = Depends(get_db)
):
    """Update server configuration"""
    try:
        # Create backup before updating
        await backup_service.backup_config('pre_update')
        
        # Update configuration
        current_config = db.query(ServerConfig).first()
        for key, value in config.dict(exclude_unset=True).items():
            setattr(current_config, key, value)
        
        db.commit()
        
        # Log the change
        audit_log = AuditLog(
            user_id=current_user.id,
            action='update_config',
            details='Server configuration updated'
        )
        db.add(audit_log)
        db.commit()
        
        # Restart required services
        await monitoring_service.restart_services()
        
        return {"status": "success"}
    except Exception as e:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=str(e)
        )

@router.post("/backup", response_model=dict)
async def create_backup(
    include_user_data: bool = False,
    current_user: User = Depends(get_current_admin_user),
    db: Session = Depends(get_db)
):
    """Create a backup of server configuration"""
    try:
        backup_path = await backup_service.create_backup(include_user_data)
        
        # Log the backup creation
        audit_log = AuditLog(
            user_id=current_user.id,
            action='create_backup',
            details=f'Backup created: {os.path.basename(backup_path)}'
        )
        db.add(audit_log)
        db.commit()
        
        filename = f'outline_backup_{datetime.now().strftime("%Y%m%d_%H%M%S")}.zip'
        return FileResponse(
            path=backup_path,
            filename=filename,
            media_type='application/zip'
        )
    except Exception as e:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=str(e)
        )

@router.get("/audit-logs", response_model=List[AuditLogResponse])
async def get_audit_logs(
    limit: int = 50,
    current_user: User = Depends(get_current_admin_user),
    db: Session = Depends(get_db)
):
    """Get audit logs"""
    logs = db.query(AuditLog).order_by(AuditLog.timestamp.desc()).limit(limit).all()
    return logs

@router.get("/alerts", response_model=List[AlertResponse])
async def get_alerts(
    status: Optional[str] = None,
    current_user: User = Depends(get_current_admin_user),
    db: Session = Depends(get_db)
):
    """Get system alerts"""
    query = db.query(Alert)
    if status:
        query = query.filter(Alert.status == status)
    alerts = query.order_by(Alert.created_at.desc()).all()
    return alerts